package bpool

import (
	"bytes"
)

/*
BufferPool implements a pool of bytes.Buffers in the form of a bounded
channel.
*/
type BufferPool struct {
	c chan *bytes.Buffer
}

/*
NewBufferPool creates a new BufferPool bounded to the given size.
*/
func NewBufferPool(size int) (bp *BufferPool) {
	return &BufferPool{
		c: make(chan *bytes.Buffer, size),
	}
}

/*
Get gets a Buffer from the BufferPool, or creates a new one if none are available
in the pool.
*/
func (bp *BufferPool) Get() (b *bytes.Buffer) {
	select {
	case b = <-bp.c:
	// reuse existing buffer
	default:
		// create new buffer
		b = bytes.NewBuffer([]byte{})
	}
	return
}

/*
Put returns the given Buffer to the BufferPool.
*/
func (bp *BufferPool) Put(b *bytes.Buffer) {
	b.Reset()
	select {
	case bp.c <- b:
	default: // Discard the buffer if the pool is full.
	}
}
